Decay of the preponderance of the IBHs gives rise to the Hot Big Bang, and can also explain the baryon to entropy ratio in the universe. Moreover, density fluctuations in the IBH gas might lead to merger and coalescence of a tiny fraction of the IBHs into more stable PBHs, which can explain the crossover from the radiation to matter dominated eras and plausibly the observed dark matter in the universe. Thus, all of the required features of the cosmology of the very early universe can be explained by simple models with a small number of parameters. These models also resolve the conundrum of the initial singularity. At very early times, the CEP implies that the universe in any causal diamond is a finite dimensional quantum system. If one views general relativity as a hydrodynamic description of a quantum system obeying the CEP[1]}, then it is no surprise that this description breaks down when the quantum system is small.
